from Mariopteris cordato-ovata Weiss,” is much more 
pronounced than is indicated by the figure. American 
investigators have disregarded Zeiller’s citation because 
the location of Lesquereux’s specimen was unknown. It 
has been found in the Lesquereux collection at the Bo- 
tanical Museum of Harvard University (number 6331). 
It conforms in every particular with Zeiller’s figures and 
descriptions. Diplotmema ribeyroni has been found at 
Pottsville, Port Carbon, Rennerdale, Monongahela and 
Waynesburg, all in Pennsylvania and at Providence, 
Rhode Island. 
The late Pennsylvanian rocks contain many of such 
‘*Permian’” indicators. Their presence carries far more 
significance than the typical Coal measures plants among 
which they are submerged. 
The occurrence of Taeniopteris in the Appalachian 
province is a fortunate event because its precise distribu- 
tion in the Pennsylvanian Series can be determined. 
Fontaine and White found two species in the W ashing- 
ton or Lower Dunkard. Now the Monongahela Group 
beneath is also known to contain T'aeniopteris jejunata. 
Consequently it would be difficult to reconcile the opinion 
recently expressed by Jongmans and Gothan” that no 
equivalents of the Kuropean Stephanian occur in eastern 
North America. Both the Washington and Monongahela 
Groups are Stephanian and characterized by a few ‘‘Per- 
mian’’ types. ‘Taeniopteris is one of the most constant 
and widespread of these types. 
* Foss. Fl. p. 28. pl. 1. fig. 1. 
al 
“1034 Jaarverslag over 1933 Geol. Bur. Nederl. pp. 17-44 
[ 148 ] 
